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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559e8ec80e7586c173fa06b323de6aefa85d2b531487ab917479feb64f400343' 
  AND token = 'Fn/T4fgjszmt2ZHOqCZNoBuPx4/ou4LBn8kEoz/iul0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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