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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ad698d26806443ac80fafa5c1a1b742b1da46cda8882abe414e5b32d4630eb' 
  AND token = 'OsBIVPoaOoo9mCzw0yNyUnJaMjZZPKDhFP/J0m4VIjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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