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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8968ce718d1b3cc2a10d0f3d7027e0cec4783726f586729675bc04ad564059f8' 
  AND token = 'E2/U0R3e7vEUaIYd8bY3Li0EbmpzCTHHHCrch3p0+mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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