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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2e8835a3a79d5363199126a1c5108ea1b5ed5530e247dad513f01f713121e8' 
  AND token = '01TZMeP5ND7Ruaf0KIVEdlo9abc2anDpM/zMDnIzdt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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