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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79f91567b96e0c514e7c02f14ce8a4ddc4e541105c7847a99cd46827dbc9840' 
  AND token = 'BlJYnfi7JS6gD5HTcYEUYe76Q8oR7gua/wcYqJoh3kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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