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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412ec14f0fcb9619464bf8257a4369b82986ad47ed2ce9f9fd5fe35fd3574fac' 
  AND token = '7egCh4/JcV5HTjhtPc01yM0lN0nJXntF+Xyw4pPv6CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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