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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d999716cdae7f5d624f7c585fc579a1797eff1756efae141f4c6a638d0afed' 
  AND token = 'MtkRMkUre1CC5fL79P6ZtL+W4+myb7kY4XiQ10yaPJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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