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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58d0840282af33980ff5dd6b33dca415133a0b70fdd4378a65dcf5557e78537' 
  AND token = '9E8l9KjuqAGPeneuzBHn2gKnzxczHM71MEPM+O5u++E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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