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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30c43e4d6465c77e23517b73b5b5811880acf7060fdd5dfde09ee7a02485d81' 
  AND token = 'wL9PGrpAt6Qd2wd54PF/hkJuLO/s9+NtYIo2NGelWkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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