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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6313d4e40f7df968432d67a513133b89190d9d4d7a71201593c8e968630f30b5' 
  AND token = '/9l9Zz0Q82msLR3Re56sAfqsYAS/kSCgSP1DkeBa8DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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