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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4af7fd4ff1aa1b28d01b1cb3e787a5cac9bb45fb58eca15de56b2d1e67a7ad5' 
  AND token = 'NCZ2411pQ9qVQfe+2oD/1L0bNzrR7s8liksDKG77m50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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