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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1db91d2cff1ef8782f5d2996ba824ed48c5d2893eade2ab432d5ebbc432e09' 
  AND token = 'H/wk7JXgSiZmewbS554AmcbXqbZlZmJ/y7MgqC0qkF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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