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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf47b7d67370c9f91a5fbe1738a906aeeeae98c86078dec922e00a7731d99601' 
  AND token = 'asfxY5ffepSlj8DmnUO0rNTiwwzO+aC5eblAViHNzYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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