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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce72cb9b620f25e8198bca64916759203c0d4862485feb2bc18917b975c7a99' 
  AND token = '1NY+l3d9b0TyGEm+dEel6AZo8l0AkU/pUHf4ilKLY2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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