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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c91f54feb672dbe39f20463d4a2f0f634d5a57a54b17f4d6096ca9c6b97f4e' 
  AND token = 'HYv5hktfp2eGGDV4N3mfRAAyGYLlkBKSY2a+8cLuZ9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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