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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec71523e419dbda03c393bbdcbd98fe041f1c7daee8342d8233d5cbcaf21898' 
  AND token = 'n7OMumyhsc1p2f7zU53of+n3eNBdaTtqhDrQEqeNZnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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