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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8ec09d1e625af455b03215757e1eae3468167fb41adba79a159bcfc4822b33' 
  AND token = '4Iimy3TQ00E+qbS+ARj+v6LcqJwShhnqH4mB5JfocD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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