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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d68b09f5affb4c914ee1a65ce762abcc8c95290531cea181266ef69ef451dfc' 
  AND token = 'SUU0pkYPc8pwbw7/rDxAK12xAt6C9HzkOJjWzpfT5w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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