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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d6a7ceea306f9f3582fcaf229e7ed2dd8b7fc7c7d6044db253ba67036133b76' 
  AND token = '8peEElJWF4jTmZia4gKad4NEwZtv+ceovQhIMUCVK8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00173

JSON explain

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