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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7a02e07e1687cc6705588cedd506eb80b36ebf8b15fa6f1e2e01edf2473f30' 
  AND token = 'EIcbyvRmDSkJ/V0Ysa9NIPz14WoIz3t4+EP9dDlekfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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