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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e4d31e05a434a21a8f3e12a350ac6bfd83ca7259af19d978e67b1cc62e69ee8' 
  AND token = '447m5MzKLAe/T5z4idDvNYH6fmW9qtQ4enf10kz95Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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