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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afddb82c5333c425a3ce0e56af2c6774b7f108edeb4eb0bd34a2e456b0e68b90' 
  AND token = 'iTc9xDRLphsBKeufKNzKRJoOVAcBBqM8fO+d4G4VzLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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