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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ec6259adf9342813fe93bebfc503be6668bdb7247ce57aa7597f573abf8adf' 
  AND token = 'MkHT3x+eKdyDOR8Wq00yOQh48VRTorpI9QBhn2YvZAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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