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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb3ae05997f07ed4780336d1ff13ea71b0ceddb85ba0cc517b5f7ba59ba9550' 
  AND token = 'o6ypVU6pXbUAffAQJQEjkij8/mCHPeOShtfu58chHfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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