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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd637e79594c4c37035c14467103b48d8abf8ef987942f2d3e7a389e357a4b247' 
  AND token = '0fPwTPALH0GRo36xjGdd1xCPhaZKHplUKdkmLqml5G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}