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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c402d969031920f88e87ba90c92752be15777fdb41b699c62eb76daa82665e' 
  AND token = 'kKBCz9j9zRcB4eayd4JWPUxg26gTDI1I9j/RUtq5hf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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