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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316fabf8c736b82bc28ab076a69b5880e941511e0bc6fa1347cb2872564585d8' 
  AND token = '4/tRJWBimF6/mzPbQN8wLymsqI2MocdbBr543BCgPyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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