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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae084677115987e65874a468a7eb6c43501c9cd1a22910b077395f233bc0675' 
  AND token = 'M/390oM1GSLKAT3tSKJoINnL+ZlwVAv6SiadHQCNsN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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