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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90abcbb80bebc5b0f936567d4f91055af4832eaf1c0eeea101a26559523ff69a' 
  AND token = 'Nv2qT2ltr3mrmsmmjKqmV7JdR5mRJLcpNHbLZcqj78A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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