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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63339152341cddcfd5c3b430c2197baaab6ce2c75e4213baf53e84dc76513d87' 
  AND token = '3uMzJIyk3HP6nk3PVqbCf85/Rbz9mjL5CW+ZT45sz8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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