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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb55266105e000c05674b4be6febf4742d79bbc4a23978b54d63569020fb028' 
  AND token = 'BQDDebqatXbFQAb+FLFz1z0Ve0LqnCN7IdKMAAV5TC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

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