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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f830b1a614100f34362bde6a2381a574b56093c3d6859943a7407968fc99bca2' 
  AND token = 'ibEPd51+v6SK8O/ae1t0THX/Vqm/81tnkuXytiaGD/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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