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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255101da427ca29d55a0eeb998617f5df902dbf7e673276f2d6035655d08cde5' 
  AND token = '/k0TdT0i/T1bjaerjUmG/0zZ5Qv23R21RmvpotsFMsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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