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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27a62cec0d38ab4762b6eaf48716cd86d22d78681ab5f1e2ba1ae67446f013b' 
  AND token = 'ma2xPBDv87TOeJDR5yW+4Tgx+XGHtShI2yh5juLdcjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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