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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eab069e2ba396f4cce1e8bf990b5fa433f0fed4e0dec2c76da56c6a6b4b1ee7' 
  AND token = 'ifsv9yq1I0dfjYnPr3pOiko0fS96uBcooBCMOAH7fBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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