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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5138fe8a9df3862dbbc73ac334b05fc440a914855d1a6dde4c36bcd04a86ee' 
  AND token = '6zVzO8ilJijzxz5SXFoaFs5R4lX8J+cS8MMwSLy99dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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