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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be291bc8f99481333735a799e3af1788b6d3fd4193f7291db88874bd929e710' 
  AND token = 'Kka22D3e5pnLCbqSv64qPu7jmUhYnYw8i2L1t6DyBYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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