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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56bb0b33029b7c710a6469b6b077eba8ccadf64e8010fe78207d109213faa77b' 
  AND token = 's8XDjbEt+yKXdKT7Z82b1qM2TkoEEhiDnWn8j1bS4AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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