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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7556eeed144bc571748faf1566c2814c8a38b967d0e4b4a4f902d47fbd9433' 
  AND token = 'T1qf8vAz8p3f/CYk4qzERUHQMZSsKJz0ul7my11yzQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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