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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a896693eb4f6ce53c5d0cd992ed79fccbc1ebb19346cf028b7c06d7c538e47b' 
  AND token = 'ixgrK5uzu3oi8t2q9VfD0ehRRUvkjmcos9IwZNLyjOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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