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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f235955f29ecb92294b613c7a6fff309cc30e717dca1399523231a4e4440203' 
  AND token = 'HXKjIknMVIF8HdEr3SbUkpe1y5UJB/v7b73LGy8mj3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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