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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef486576315fec0dd6739271df2bed1df3f0bd96da03be8fb66f98581d9e575' 
  AND token = '5wW8VVflZMQlDJoG6s9O961RIJ7Da2tQbDanmEt34oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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