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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3113454bef43c67e87a2129d42918e4e790af4977d26b47cf44b402be3455889' 
  AND token = 'Htbvk7vgYFq7N9I5bsb+CMfykuetgotYv+sPQhC3Qzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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