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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2371f9f784b9b12293b8cf3ac0ccc490805690f4b21ec7a74095c42a45f5ec97' 
  AND token = 'Llp7VJz04fTaiztb+5hLA5bghzEMsQtsPMFP/pVXdmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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