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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3903156b62b0d5884813e8e0e0528396d88dc6e831c08c214ef9ac07f8ea3c9' 
  AND token = 'q5bchtzAeqwfYklPCmzemc4E2otze7RNM/aR4z183d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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