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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b142f4ff96be896812950c4d850dee07fde8697698d3ed44b78a23083d32f256' 
  AND token = '3AYW5zeUKSmqTnXoHG7ybB0JrN66XvJfXcpK5c2IVRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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