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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c2c45b90ee3ffcfa80288d2a9cb2e091c049134f32314d2bb64b21e941731b2' 
  AND token = '/VquTQ5IztMguQd9I5tqEzaGJTnvo3ePBSqNHilyP+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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