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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d70afddde88a59e490fcbeaa7a0850f7309b27d1855c6badb5ec0d8058b4dea' 
  AND token = 'WcMtd+LRtvX8BfIyMX1/RV1J0fr2rjH6772eAJqP6g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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