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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '246ad7f3e98080ca9783dc1f60b7244c18dd1947ef19e3fc623b51be6bd8d82e' 
  AND token = 'CC9IlKCR0UWMR6WC0ZUjtsLsY3o4Ynn+G5B5ywiGFxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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