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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7157f170f5e21b8d5da2fb623dc64abdf8afbc7a42af82e7ad27b7f08d82aba7' 
  AND token = '45EEf80487mB0uXH2VhI8wNl/DHsI6C/iKZ51yUa4Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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