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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a446368ac6b14b764d397d0f20b2d6e1e1457f8855e9447905d4773a6a2947' 
  AND token = 'jtDapSS3P5xsTXGZ+Al2wMhOuzq1szkee9sK9yflcgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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