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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6982dd482eec80fe90015037d923404140aa505f46187145fd5870ec7c966eac' 
  AND token = 'r3ziVo3EU2qZmRV4J/I3/15vNWzi7DFiLyqngZLQ/gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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