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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98195d94d923f88bea063cc475676973d2bc159f515c5e8609d4c1f1f670897' 
  AND token = '2jUt0gfioL27SwXvhZJfx7CEU2LftHcXgzfe4bc2/Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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