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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294fd6c75f1d698ece0a61306fdd27adc6d452a1b46808179d9dc730776c3203' 
  AND token = 'fiC1Oz+QxXEQjKRp24MYdgUOIlxm/QRa+2qkXarbSho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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