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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8d69870f7cbc98609569f07a47fba02f6ec855763596e47789486de2437b28' 
  AND token = '0TyhrJrScDQYlDil74kiF0wY3D7cSZcry01AeJgp9GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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