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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1bb86125095b046c9c70ca127b8c6a00a2a69c9ff07cd08de858c797cc7589d' 
  AND token = 'ZPpXDU/xZgrCOa39fnhEyQrccc/cNucuqhoQoKjwe0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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