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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636092ac5a702817c72a8db9e26e6a297cffe80133b0d8d604bb66c4c321d399' 
  AND token = 'z440LLJE9f583ZKwicX5G7HmJWribJkfzw+fNxhza/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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