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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4748d6cd2993208f5e8080663172fe3e9b6d15c0d2ccc4fa8e86119def0c87' 
  AND token = 'mOuk+Wd+3yadsbgmLctUbakdmtPn3EeFJ8R7MGgi9b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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