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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e93381d6d00a7fd623ba90ce5450dd33e0319c2542a41d52ec5ea591157397b' 
  AND token = 'zWMofn5QEEy42v3AwVsXmlgLjltf4CTWLIa5dxwlMJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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