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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e5c5937bab271de49228d6fd33f91a0e838714582d7ea7b720bb540a23693a' 
  AND token = 'oLv8J919GhD0kVW6erNz2d/nzvogbU9bIVM9/hapVNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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