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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f10e7ffdfea1d3a50227f4181b201372c00d5aab447808947f879c5a50a28eb' 
  AND token = 'Vc1Vw5Eci9M/Axpe4VnpEG+CcmFVxmeSq1hDbDhGfuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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