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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a809ff46e5ae824303c9442094d01ea55653645ee029b78523eee85f7a988618' 
  AND token = 'NdeC3qNZ74fNegtoIIk1zGQYK9v96Hs4/hlnP0PdJM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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