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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09791a5dc33b5b4936503618d6869e5ff516ea0bce70cc6826561a6a43dc00d2' 
  AND token = 'hl65dE4x0+4wcPBc4F5p+i4ZAbNtFafC53HIH2hqaN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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