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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bdbb0e80748fafe554c417d14eb192f15fc75dacb471f0ef8bcc1e385815522' 
  AND token = 'szhHN1PJTyK6jrESLwP+wrDytBtyUard1ODhN9rY7O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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