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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffef5a8e1b170a8567e6148ad2da2bf9a46b5ac64258cece1ec51e52638457c' 
  AND token = 'fWYlP9ZmkT3gaWtfdSgScpo/jLeEzAAo9nxjz3pFxMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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