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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e784da41dc5982769b46d45bceab46cd26ad73669a5798436cf04e6b1540061' 
  AND token = 'gGxwLJLJlE+IHjL+Nv4AcTt4eRoTkadrxN5GZxeJ+8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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